Grinding or polishing machinery.



am 0 9 1 0w 3 B N U .J D E T. N E. T A P T E S S I B L D 5 0 N 2 3 7 0 N GRINDING 0R POLISHING MACHINERY.

APPLICATION FILED D30. 18, 1902.

H0 MODEL.

I 7 Am /Kg By Wi wsses a, a. (1 m wenbrr mzmonms PETERS co.. PHOTO-LITHCL, WASHNGYON, n. c.

Patented June 30, 1903;

PATENT OFFICE. I

DAVID LOGAN IssEnoF SHEFFIELD, ENGLAND, ASSIGNOR To THE ou'r- LERY MANUFACTURERS ENGLAND.

SUPPLY COMPANY, LIMITED, OF SHEFFIELD,

GRINDING OR POLISHING MACHINERY.

SPECIFICAT N forming part of Letters Patent No. 732,505, dated June 30, 1903.

Application filed December 18,1902; Serial No. 135,744:- (No model.)

To all whom it may concern.-

Be it known that 1, DAVID LOGAN BIssE'r,

engineer, a subject of the King of Great Britain, residing at 6 Thompson road, Sheffield, county of'York, England, have invented certain new and useful Improvements in Grinding or Polishing Machinery, of which the following is a specification.

This invention has forits object to improve the construction of grinding and polishing machinery, and is particularly applicable to such machines as are employed in operating upon knife-blades and articles with either perfectly flat or slight'convex surfaces.

According tothe invention the Work is carried on a double-ended reversible work-holder which can be turned over end for end after one piece of work is finished to bring the next piece into position. This work-holder has an arrangement for moving it transversely across the grinding or polishing surface and also for imparting a rocking motion to it parallel with'said grinding-surface inorder to present to the grinding-surface the whole face of the object to be ground and to obtain any desired degree of convexity. It is also mounted on a sliding saddle which isautomatically operated to press the work against the grinding or polishing surface for the prescribed time and to then drawit back toallow of the work at the other end of the holder being brought into position. At the opposite side of the grinding or polishing surface or wheel a truing device is provided which is also arranged to be traversed across the said surface and trues up the latter at intervals, so as to keep it in proper condition.

Referring-to the accompanying drawings, Figure l is a side elevation of the improved machine. Fig. 2 is a plan of same. Fig. 3 is a detail and front elevation of the jaws of the work-holder. Fig. 4 is a section on the line 4t 4:, Fig. 3.

1 is the grinding or'polishing surface or apparatus, which may be a wheel of ordinary sandstone or other suitable material. 2'is the spindle on which the said Wheel or grindstone is carried.

3 3 are suitable bearings securely fixed to blade-to be operated upon.

standards 4 in the framing and serving for the spindle 2.

5 represents the jaws of the work-holder, which are of special construction to suit the shape of the article-say a forged knife- The said article is held in position by clamps 6 and supported by packing-plates 7. The said jaws are fixed in pairs of right andleft hand on the end surfaces of an adjustable double-ended arm 8, forming the body of the reversible workholder. The-latter is mounted on a shaft 9 in suitable standards 10, fixed on a sliding saddle 11. The said shaft 9 on which the work-holder is carried receives a transverse motion, as hereinafter described, while at the same time rocking motion is transmitted to the-work-holder in conjunction with the longitudinal motion referred to. This rocking motion is imparted by a special clutch arrangement 12, mounted on the boss of the adjustable arms 8, and a rocking arm 13, which receives its motion from an adjustable eccentric 14 or by other convenient simple mechanism.

The sliding saddle 11, which is fitted to a suitable bed or sole plate 15, carries the workholder and mechanism for producing the longitudinal and rocking motion. The said saddle is operated by a disk 16, carrying a pin which engages a cam-groove in a special fixed piece or cam 16. This cam is so constructed that it will move the saddle and all thereon forward to bring the work into contact with the grindstone and will then after allowing a sufficient time for the grinding operation return the parts clear of the grindstone. These alternate retiring movements allow the attendant after disengaging the clutch bya hand-lever 17 to turn over the work-holder, thereby presenting two fresh pieces of work to the grindstone. The lever 17 may be provided with a pressure-spring to keep it normally in the engaged position.

To follow up the wear of the grindstone, a special arrangement of worm and worm-wheel 18 and sliding screw 19 is applied and operated by a hand-wheel 20, placed in a convenient position. The screw 19 is so arranged that it is pushed endwise by the cam 16", said screw being connected to a slide-block 16 actuated by the cam. The worm-wheel 18 constitutes a nutfor the screw and is carried between a pair of lugs on the saddle 11. Hence when it is turned by the hand-wheel on the shaft of the said work-wheel and disposed at right angles to the screw 19 it screws the saddle along the screw 19 and thereby adjusts the limits of travel of the saddle.

The transverse motion above referred to is imparted to the work-holder from a shaft 21, on one end of which is a crank-disk 22, giving the necessary movement to a vertical lever 23, pivoted at its lower end and attaehed by links 24 to the end of the workholder shaft 9. The shaft 21 is driven by a bevel-wheel 25, gearing into a pinion 26 on a main driving-shaft 27, on which are fast and loose pulleys 28 for a driving-belt. These pulleys are carried by the saddle and are driven from overhead, so that the comparatively small motion of the saddle shall not interfere with the belt. The said shaft 21 also carries a toothed wheel 29, which gears into another, 29, having a feather-and-groove connection with a side shaft 30. The shaft 30 gives motion through a worm and wormwheel 31 to a set of change-gearing 32 for driving the cam 16, which advances and retires the sliding saddle 11. The cam 16, driven by this change-wheel arrangement or other convenient gearing, allows of the proper interval of contact between the work and the grindstone.

In order to keep the surface of the grindstone in good condition, a device is employed comprising a series of thin corrugated disks 33, of very hard material, clamped side byside on a spindle fitted on a carriage 34. This carriage, with the disk-wheel in contact with the grinding-face, is fitted on a pair of rods 34, carried from the nuts 34 of the side screws 35. The carriage is also connected by a link attachment 35 to a rocking frame 38 and is traversed across the stone with the disk-wheel in contact with the face by means of a link attachment 39', connecting the rocking frame 38 and the crank-disk 39, which receives its motion from gearing 10 and fast and loose pulleys 41. It serves to abrade the grinding-surface of the stone and so keeps a perfectly-uniform and keen cutting face on said grindstone. To follow up the wear of the grindstone, the disks 33 may be advanced by means of side screws 35, and gearing 36, operated by a hand-wheel 37, is applied.

The operation and mode of working are as follows: The grindstone is first properly raced and trued up, both on the face and sides, and its speed regulated to suit the work and the work-holder faces shaped so that the face of the blades or articles to be ground will be brought parallel with the grinding-surface and fixed on the end surfaces of the adjustable double-ended arm. It will be recognized that the work-holder face, which is shaped for a ground side of the blade to rest upon, will not be suitable for the unground side to be placed against, as this would present the blade in the wrong position to the grinding-surface. I therefore adjust the lefthand plate of the work-holder to receive the forged side of a blade on its face and the righthand part of the work-holder to receive the ground side of the blade on its face. I place a forging in the left-hand Work-holder and fix it in position by clamping the tang by the adjustable attachment fixed on the outer end of the work-holder and also by adjusting the plate for supporting the back edge. This blade being new securely fixed and ready for grinding, I unship the clutch and turn over the reversible arms and work-holders and repeatthe same operation with another forging on the opposite left-hand plate of the work-holder. I then adjust the transverse movement to the necessary stroke by the adjustable crank-disk, which is connected by a link to a vertical rocking lever attached to the end of the shaft carrying the double-ended arm and clutch-gear. Sulficient rocking movement is given by the adjustable eccentric to cause the whole of the blade to come in contact with the grindingsurface, the degree'of convexity being fixed by the length of swing of the rocking arm. I next bring the sliding saddle forward by turning the hand-wheel at the right-hand side of the machine until the outer surface of the blade in the work-holder comes in contact with the grinding-surface. I then turn over the work-holder arm and adjust the parts until both faces of the blades on opposite jaws or holders are touching the grinding-surface to the same amount. The machine now being adjusted for a certain class of blade and the time allowed for grinding having been previously arranged by the sliding-saddle operating-cam having been given a certain shape, I now withdraw the blades clear of the grinding-surface by turning the cam until the roller fixed on its side comes in contact with the internal cam,which brings the sliding saddle and all thereon back just sufficient to allow the turning over of the reversible double-armed work-holder. The grindstone and the other parts of the machine are now set in motion and the sliding saddle carried forward, bringing the faces of the blades in the holders into contact with the grinding-surface. After remaining thus for its prearranged time it then returns clear of the stone, allowing the attendant time to turn over the reversible arm, thereby presenting a fresh blade ready for the next forward movement of the sliding saddle. \Vhile this second blade is being brought forward and fixing it in the same Way as on the left hand, thereby exposing the unground side, he now takes a fresh blade and fills the left-hand clamp-holder as before. This presents two unground faces ready to be turned over as soon as the operation of grinding the opposite side and the withdrawing of the sliding saddle has taken place. The attendant repeats the same operation on the second side and is now in a position to present two unground faces to the grinding-surface, finishing one blade at every turn of the arms and keeping up the continuous operation of takout ground blades and replacing by unground. It may be pointed out that it is not abso lutely necessary that the blades should be done as described above. Another method is to put fresh blades on the right and left hand holders of the same side and to put the blades with one side ground on the opposite right and left hand holders, and yet another method is to put fresh blades on all four holders and grind one side of a quantity, then go over them again and put the ground side next the face of all four holders and grind the second side.

While the blades are being ground the grinding-surface gradually Wears away. A

. means of following up this wear is provided by the hand wheel at the right-hand side, which is carried from the top of the sliding saddle and is connected by a shaft to a wormgearing into a worm-wheel fitted on a screw, the end of which is attached to the slide with the internal cam at its end and carrying the roller for the external cam working against, for pushing the sliding saddle forward. The

worm-wheel is held in position by projecting bosses from the under side of the sliding saddle. Consequently by turning the handwheel a very fine adjustment can be got and so arranged that the bladeswill all be equal in thickness when ground. The truing arrangement at the back of the stone is also adjusted by the attendant at the front operating a hand-wheel connected by a shaft to gearing and screws for traveling the carriage carrying the racing or surfacing Wheel forward as the stone wears down. The racing-wheel has also, as stated, a transverse movement across the stone, which keeps it level and prevents glazing, thereby keeping a keen cutting edge on the surface.

As the machine described is equally adapted for grinding or polishing, merely involving a change in the abrading-surface employed and possibly in some minor details in connection with the work-holders, therefore wherever grinding or polishing are separately mentioned both operations will be understood to be included.

What I claim, and desire to secure by Letters Patent of the United States, is

1. In a grinding or polishing machine, the combination of a grinding or polishing apparatus, a work-holder to receive the work, and means for imparting a simultaneous longitudinal and a rocking movement to said workholder, substantially as hereinbefore described.

2. The combination of a grinding or polishing apparatus, a reversible work-holder, a shaft supporting said Work-holder means for imparting a simultaneous rocking and transverse movement to the work-holder, and means for imparting a rocking and traversing movement proportional to the length and width of the blade or object to be ground, substantially as hereinbefore described.

3. The combination of a grinding or polishing apparatus, a reversible work-holder, a sliding saddle carrying said work-holder,gearing and a crank and lever on said saddle for giving the necessary transverse movement to the Work-holder, an adjustable eccentric, a fork-ended lever connected therewith,a clutch mounted on the boss of the reversible workholder, and a hand-lever for disengaging said clutch to allow the work-holder to be turned over so as to present fresh articles to the grinding-surface, substantially as hereinbefore described.

4. The combination of a grinding or polishing apparatus, a reversible work-holder, a sliding saddle carrying said work holder, means of imparting a to-and-fro movement to the said sliding saddle by a cam arrangement, gearing for driving said cam, a side shaft for actuating said gearing, a sliding wheel on said shaft, and gearing on said sliding saddle for driving said wheel, substantially asdescribed.

5. In a grinding and polishing machine, the combination of a reversible tool-holder, a sliding saddle carrying the same, an adjustable screw for feeding said saddle forward to compensate for wear, and a worm and wormwheel for actuating said adjusting-screw, and means carried by the saddle for imparting a simultaneous and rocking motion to the tool-' holder, substantially as described.

6. In a grinding or polishing machine the combination of a reversible work-holder, adjustable arms thereon, adjustable clamps on outer ends of work-holder, plates on said Work-holder for supporting and holding in position the articles to be ground, a sliding saddle and a shaft supported thereby and carrying the work-holder and means for presenting to the grinding-surface the whole face of the articles to be ground and obtaining any desired degree of convexity substantially as described.

In testimony whereof I have hereunto set my hand, in presence of two subscribing witnesses, this 4th day of December, 1902.

DAVID LOGAN BISSET.

Witnesses:

WILLIAM IRVING, O. W. SIEVEWRIGHT. 

